We have an Android TV, Anthem AVR, and the Roku Ultra. The Roku is connected to the TV via HDMI and the TV is connected to the AVR via HDMI arc. When the TV and AVR is turned on (Roku also on) there is no signal received on the AVR and the arc audio output option on the TV is grayed out.
We have also tried connecting the Roku directly to the AVR and sending video to the TV with HDMI arc but this also causes it's own problems. With this connection, we get constant HDCP 2.2 errors that will pop up making TV unwatchable.
The only thing that works is to do these steps every single time we want to watch TV:
1. Unplug the Roku Ultra's power cord
2. Turn on the surround sound system
3. Turn on the TV
4. Clear the TV cache
5. Replug the Roku
It is such a pain, and I do not plan to get rid of the surround system. Any suggestions?